Grinding-mill bur.



UNITED STATES PATENT OFFTCE.

LOUIS E. GAISSER., OF LOUISVILLE, KENTUCKY, ASSIGNOBJ, BY MESNE ASSIGNMENTS, TO RED CHIEF MANUFACTURING COMPANY, OF LOUISVILLE, KENTUCKY.

GRINDINGr-MILL BUR.

Specifieaton of Letters Patent.

Patented Feb. 2, 1915.

Application filed October 21, 1912. A Serial No. 727,037.

To all whom tt may concern:

Be it known that I, LOUIS E. GAIssER, a citizen of the United States, residing at Louisville, in the County-Of J efferson and State of Kentucky, have invented a new and useful Grinding-Mill Bur, of which the following is a specification.

This invention relates to an lmprovement in grinding burs.

The primary object of the inventlon is to improve the construction shown in the patent granted me Aug. 31, 1909, No. 932,543.

A. further object is to provide a flat rotatory bur with ribswhich extend entirely thereacross and substantially coplanar throughout their entire length and which ribs are sharpened at their inner extremities in order to Cut the grain and are flat at their outer eXtremities to successfully rind and reduce to the desired state the :grain prior to its final ejection from the burs.

A further object is to provide a grlnding rotary bur with a plurality of rlbs sharpened at their inner extremltles and substantially coplanar throughout their entire length and to provide a second set of ribs which are adapted to clean the various spaces intermediate the ribs and to prevent the permanent lodgingof gram between the spaces defined bythe rlbs.

A further object is to provide a plurallty of raised lugs extending radial of the flat bur and projecting beyond the outer periphery thereof and which act in the capacity of vanes or sWeeps and provide for the proper ejection of the ground material after it has left the ribs.

With the foregoing and Other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of What is claimed without departing from the Spirit of the invention.

In the drawing: F igure 1 is a front elevation of the female grinding member. Fig. 2 is a longitudinal sectional view of said member. Fig. 3 is a side elevation of the male grinding member. Fig. 4: is a front elevation of said member. Fig. 5 is with an opening 18 through which the grain passes to the burs. The member 17 is provided internally with ribs 19 said ribs bemg continued over the flange 20 of said member.

The -stationary conical member 17 is maintamed in position by the lugs 21, its reduced end 22 being bored to receive the shaft 12. This female member or what might be termed the Cup bur is formed with leaders 24, each of Which is formed with the feeders? 25 which cut in such a way as to crush the grain.

The male bur 26 is formed with the conical grlndmg surface consisting `of nine leaders 28, each of which is formed with three feeders 29. The number of leaders and feeders however, may be changed so as to suit the grain to be ground. This bur is formed With lugs 30 Which extend radially from the cylindrical portion 31 of the bur. The flat rotary bur 32 which corresponds with the flat stationary bur 20 is formed adjacent the opening 33 and on the face remote from the curved ribs with slots Which receive the lugs 30 of the conical bur, the flat bur 32 in this manner being locked to the conical bur. The rotary fiat buris formed With four raising ribs 35. The male bur 26, may be formed integral with the shaft, or may be formed separate and held thereto by welding, a set screw or other suitable means.

As illustrated in Fig. 6 the ribs of the rotary bur extend entirely across the plate and lie in a common plane except at their ends where they dip slightly. The raised ribs 35 lie in a common plane throughout their entire length and terminate in a Sharp shoulder at the inner periphery of the annular bur or plate, thus allowing for the entrance of the grain between the fiat burs but at the same time insuring that the ribs will grind the material at all times while passing from the inner to the outer extremities of the said ribs.

The plate or body portion of the flat bur eXtendS beyond the surface across which the ribs extend and is disposed below the said surfce es at 36. The flat bur 20 llstret d in Fig. 2 is also provded'wth en outer rm 37 hich is disposed below the plane containing the' grndng rbs Thus When the flat burs 32 and 20 are vassemloled in proper relation and in conta-et,` en annuler channel extendng around the. bura Will be defined' by the WallS Or extensions 36 lnd 87. The said annular channel re'eeves the ground material therein and provides that it Will be ejected radally fromthe burs. The annula r Channel also provides a protection for the grnd ng ribs. In order to eject the' material from the nnular Channel and in a radel manner, the lugSBS are provided as llustrated in F is. '5 and 6 and Which lugsv act n'the capacity of Vane' 01" Sweeps and eject the material from the annular channel a; rtdal manner,` Which' provides forthe proper delivery thereof from the outlet Spout of thegrndng mill in Which the burs herein disclosed are used. That is claimed is 2- 1. A flat bur for grindng mills" compris- 'g a plate With a pluralty of grnding rbs extendngj entirely thereacross and' coplnr throughout substantially their entire length, said rbs herp'ened at their nner extremities and terminating in flatfportons at their copies o f thia patent. may he obtained for and Sharpned extrenits, and o `plur lty of enlarged ribs coplanar throughout their entire length With the aforementoned rbs end terminating in abrupt Shoulders at their nner eXtremites.

.2. Afiat bur for grindng mille, c omprsng l en annular plate, Said plate provided With a pluralty of rbs extending coplanar throughout substantially' their entire length and eX- tendng entirely across the Said plate the said l'bx dp p ng slightly out of the aid common plane at their nner extremites andsharp ened at the Said extremites and merg ng into' brod fiat Surfaces at their outer eX- tremites, and a plurtl-ty of enlarged r bs efind' ng' thro therentre length in the said common plane and terminating at the nner perip 3 brupt" hirpened shoulders.

In test mony that I claim-the foreong as m' OWI,' I have heret o aflxed my Signaery of Said annular plate in 

